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  <meta name="description" content="在使用多服务器操作redis的时候，需要考虑到数据同步的问题；本文来记录一下redis里面事务的用法。 思路乐观锁每次操作的时候，都认为自己能拿到锁资源。所以吞吐量比较好。 策略：提交版本必须大于记录当前版本才能执行更新。 悲观锁是认为每次都需要拿数据时候，都会发生争抢。 策略为每次都会阻塞方式拿到资源才开始做自己操作。 乐观锁不会有阻塞，吞吐量比较大，编写难度也会简单。 Redis指令和实验">
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<meta property="og:description" content="在使用多服务器操作redis的时候，需要考虑到数据同步的问题；本文来记录一下redis里面事务的用法。 思路乐观锁每次操作的时候，都认为自己能拿到锁资源。所以吞吐量比较好。 策略：提交版本必须大于记录当前版本才能执行更新。 悲观锁是认为每次都需要拿数据时候，都会发生争抢。 策略为每次都会阻塞方式拿到资源才开始做自己操作。 乐观锁不会有阻塞，吞吐量比较大，编写难度也会简单。 Redis指令和实验">
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      redis-乐观锁
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        <p>在使用多服务器操作redis的时候，需要考虑到数据同步的问题；本文来记录一下redis里面事务的用法。</p>
<h1 id="思路"><a href="#思路" class="headerlink" title="思路"></a>思路</h1><p>乐观锁每次操作的时候，都认为自己能拿到锁资源。所以吞吐量比较好。</p>
<p>策略：提交版本必须大于记录当前版本才能执行更新。</p>
<p>悲观锁是认为每次都需要拿数据时候，都会发生争抢。</p>
<p>策略为每次都会阻塞方式拿到资源才开始做自己操作。</p>
<p>乐观锁不会有阻塞，吞吐量比较大，编写难度也会简单。</p>
<h1 id="Redis指令和实验"><a href="#Redis指令和实验" class="headerlink" title="Redis指令和实验"></a>Redis指令和实验</h1><table>
<thead>
<tr>
<th align="left">命令</th>
<th align="left">意义</th>
</tr>
</thead>
<tbody><tr>
<td align="left">WATCH key [key …]</td>
<td align="left">监视一个(或多个) key ，如果在事务执行之前这个(或这些) key 被其他命令所改动，那么事务将被打断。</td>
</tr>
<tr>
<td align="left">MULTI</td>
<td align="left">标记一个事务块的开始。事务块内的多条命令会按照先后顺序被放进一个队列当中，最后由 EXEC 命令原子性(atomic)地执行。</td>
</tr>
<tr>
<td align="left">EXEC</td>
<td align="left">执行所有事务块内的命令。</td>
</tr>
</tbody></table>
<p>通过指令来描述一次事务的操作：</p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># 监视 key ，且事务成功执行</span></span><br><span class="line"></span><br><span class="line">redis&gt; WATCH lock lock_times</span><br><span class="line">OK</span><br><span class="line"></span><br><span class="line">redis&gt; MULTI</span><br><span class="line">OK</span><br><span class="line"></span><br><span class="line">redis&gt; SET lock <span class="string">&quot;huangz&quot;</span></span><br><span class="line">QUEUED</span><br><span class="line"></span><br><span class="line">redis&gt; INCR lock_times</span><br><span class="line">QUEUED</span><br><span class="line"></span><br><span class="line">redis&gt; EXEC</span><br><span class="line">1) OK</span><br><span class="line">2) (<span class="built_in">integer</span>) 1</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment"># 监视 key ，且事务被打断</span></span><br><span class="line"></span><br><span class="line">redis&gt; WATCH lock lock_times</span><br><span class="line">OK</span><br><span class="line"></span><br><span class="line">redis&gt; MULTI</span><br><span class="line">OK</span><br><span class="line"></span><br><span class="line">redis&gt; SET lock <span class="string">&quot;joe&quot;</span>        <span class="comment"># 就在这时，另一个客户端修改了 lock_times 的值</span></span><br><span class="line">QUEUED</span><br><span class="line"></span><br><span class="line">redis&gt; INCR lock_times</span><br><span class="line">QUEUED</span><br><span class="line"></span><br><span class="line">redis&gt; EXEC                  <span class="comment"># 因为 lock_times 被修改， joe 的事务执行失败</span></span><br><span class="line">(nil)</span><br></pre></td></tr></table></figure>

<p>上述例子是实现了，lock_times和操作lock中的内容时候，事务冲突之后，被打断的情况。</p>
<h1 id="go语言测试"><a href="#go语言测试" class="headerlink" title="go语言测试"></a>go语言测试</h1><h1 id="参考"><a href="#参考" class="headerlink" title="参考"></a>参考</h1><ul>
<li>[1] <a target="_blank" rel="noopener" href="http://doc.redisfans.com/">Redis 命令参考</a></li>
<li>[2] <a target="_blank" rel="noopener" href="https://github.com/gomodule/redigo">Golang Redis库</a></li>
<li>[3] <a target="_blank" rel="noopener" href="https://www.jianshu.com/p/62f0b9ce7584">Go语言如何使用redis</a></li>
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